@mixin position($pos, $zIndex, $top, $right, $bottom, $left){
	position: $pos;
	z-index: $zIndex;
	@if $top != none {
		top : $top;
	}
	@if $right != none {
		right : $right;
	}
	@if $bottom != none {
		bottom : $bottom;
	}
	@if $left != none {
		left : $left;
	}
}

